discourse/lib/stylesheet/manager.rb

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require_dependency 'distributed_cache'
require_dependency 'stylesheet/compiler'
module Stylesheet; end
class Stylesheet::Manager
CACHE_PATH ||= 'tmp/stylesheet-cache'
MANIFEST_DIR ||= "#{Rails.root}/tmp/cache/assets/#{Rails.env}"
MANIFEST_FULL_PATH ||= "#{MANIFEST_DIR}/stylesheet-manifest"
@lock = Mutex.new
def self.cache
@cache ||= DistributedCache.new("discourse_stylesheet")
end
def self.clear_theme_cache!
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cache.hash.keys.select { |k| k =~ /theme/ }.each { |k|cache.delete(k) }
end
def self.stylesheet_href(target = :desktop, theme_key = :missing)
href = stylesheet_link_tag(target, 'all', theme_key)
if href
href.split(/["']/)[1]
end
end
def self.stylesheet_link_tag(target = :desktop, media = 'all', theme_key = :missing)
target = target.to_sym
if theme_key == :missing
theme_key = SiteSetting.default_theme_key
end
cache_key = "#{target}_#{theme_key}"
tag = cache[cache_key]
return tag.dup.html_safe if tag
@lock.synchronize do
builder = self.new(target, theme_key)
if builder.is_theme? && !builder.theme
tag = ""
else
builder.compile unless File.exists?(builder.stylesheet_fullpath)
tag = %[<link href="#{builder.stylesheet_path}" media="#{media}" rel="stylesheet" data-target="#{target}"/>]
end
cache[cache_key] = tag
tag.dup.html_safe
end
end
def self.precompile_css
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themes = Theme.where('user_selectable OR key = ?', SiteSetting.default_theme_key).pluck(:key, :name)
themes << nil
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themes.each do |key, name|
[:desktop, :mobile, :desktop_rtl, :mobile_rtl].each do |target|
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theme_key = key || SiteSetting.default_theme_key
cache_key = "#{target}_#{theme_key}"
STDERR.puts "precompile target: #{target} #{name}"
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builder = self.new(target, theme_key)
builder.compile(force: true)
cache[cache_key] = nil
end
end
nil
end
def self.last_file_updated
if Rails.env.production?
@last_file_updated ||= if File.exists?(MANIFEST_FULL_PATH)
File.readlines(MANIFEST_FULL_PATH, 'r')[0]
else
mtime = max_file_mtime
FileUtils.mkdir_p(MANIFEST_DIR)
File.open(MANIFEST_FULL_PATH, "w") { |f| f.print(mtime) }
mtime
end
else
max_file_mtime
end
end
def self.max_file_mtime
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globs = ["#{Rails.root}/app/assets/stylesheets/**/*.*css",
"#{Rails.root}/app/assets/images/**/*.*"]
Discourse.plugins.map { |plugin| File.dirname(plugin.path) }.each do |path|
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globs << "#{path}/plugin.rb"
globs << "#{path}/**/*.*css"
end
globs.map do |pattern|
Dir.glob(pattern).map { |x| File.mtime(x) }.max
end.compact.max.to_i
end
def initialize(target = :desktop, theme_key)
@target = target
@theme_key = theme_key
end
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def compile(opts = {})
unless opts[:force]
if File.exists?(stylesheet_fullpath)
unless StylesheetCache.where(target: qualified_target, digest: digest).exists?
begin
source_map = File.read(source_map_fullpath) rescue nil
StylesheetCache.add(qualified_target, digest, File.read(stylesheet_fullpath), source_map)
rescue => e
Rails.logger.warn "Completely unexpected error adding contents of '#{stylesheet_fullpath}' to cache #{e}"
end
end
return true
end
end
rtl = @target.to_s =~ /_rtl$/
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css, source_map = begin
Stylesheet::Compiler.compile_asset(
@target,
rtl: rtl,
theme_id: theme&.id,
source_map_file: source_map_filename
)
rescue SassC::SyntaxError => e
Rails.logger.error "Failed to compile #{@target} stylesheet: #{e.message}"
if %w{embedded_theme mobile_theme desktop_theme}.include?(@target.to_s)
# no special errors for theme, handled in theme editor
["", nil]
else
[Stylesheet::Compiler.error_as_css(e, "#{@target} stylesheet"), nil]
end
end
FileUtils.mkdir_p(cache_fullpath)
File.open(stylesheet_fullpath, "w") do |f|
f.puts css
end
if source_map.present?
File.open(source_map_fullpath, "w") do |f|
f.puts source_map
end
end
begin
StylesheetCache.add(qualified_target, digest, css, source_map)
rescue => e
Rails.logger.warn "Completely unexpected error adding item to cache #{e}"
end
css
end
def self.cache_fullpath
"#{Rails.root}/#{CACHE_PATH}"
end
def cache_fullpath
self.class.cache_fullpath
end
def stylesheet_fullpath
"#{cache_fullpath}/#{stylesheet_filename}"
end
def source_map_fullpath
"#{cache_fullpath}/#{source_map_filename}"
end
def source_map_filename
"#{stylesheet_filename}.map"
end
def stylesheet_fullpath_no_digest
"#{cache_fullpath}/#{stylesheet_filename_no_digest}"
end
def stylesheet_cdnpath
"#{GlobalSetting.cdn_url}#{stylesheet_relpath}?__ws=#{Discourse.current_hostname}"
end
def stylesheet_path
stylesheet_cdnpath
end
def root_path
"#{GlobalSetting.relative_url_root}/"
end
def stylesheet_relpath
"#{root_path}stylesheets/#{stylesheet_filename}"
end
def stylesheet_relpath_no_digest
"#{root_path}stylesheets/#{stylesheet_filename_no_digest}"
end
def qualified_target
if is_theme?
"#{@target}_#{theme.id}"
else
scheme_string = theme && theme.color_scheme ? "_#{theme.color_scheme.id}" : ""
"#{@target}#{scheme_string}"
end
end
def stylesheet_filename(with_digest = true)
digest_string = "_#{self.digest}" if with_digest
"#{qualified_target}#{digest_string}.css"
end
def stylesheet_filename_no_digest
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stylesheet_filename(_with_digest = false)
end
def is_theme?
!!(@target.to_s =~ /_theme$/)
end
# digest encodes the things that trigger a recompile
def digest
@digest ||= begin
if is_theme?
theme_digest
else
color_scheme_digest
end
end
end
def theme
@theme ||= (Theme.find_by(key: @theme_key) || :nil)
@theme == :nil ? nil : @theme
end
def theme_digest
scss = ""
if [:mobile_theme, :desktop_theme].include?(@target)
scss = theme.resolve_baked_field(:common, :scss)
scss += theme.resolve_baked_field(@target.to_s.sub("_theme", ""), :scss)
elsif @target == :embedded_theme
scss = theme.resolve_baked_field(:common, :embedded_scss)
else
raise "attempting to look up theme digest for invalid field"
end
Digest::SHA1.hexdigest(scss.to_s + color_scheme_digest.to_s)
end
def color_scheme_digest
cs = theme&.color_scheme
category_updated = Category.where("uploaded_background_id IS NOT NULL").pluck(:updated_at).map(&:to_i).sum
if cs || category_updated > 0
Digest::SHA1.hexdigest "#{RailsMultisite::ConnectionManagement.current_db}-#{cs&.id}-#{cs&.version}-#{Stylesheet::Manager.last_file_updated}-#{category_updated}"
else
digest_string = "defaults-#{Stylesheet::Manager.last_file_updated}"
if cdn_url = GlobalSetting.cdn_url
digest_string = "#{digest_string}-#{cdn_url}"
end
Digest::SHA1.hexdigest digest_string
end
end
end